Can chicks have any fruit or veggies?
CT also makes a very good point. The majority of their food should the regular chicken feed. It’s a balanced diet and they really don’t need anything else. If you feed them too much fruit or veggies it can upset that basic balance. How much is too much? A rule of thumb is if they can clean it up in 15 to 20 minutes, you ae doing fine.
I once gave one of my puppies a pigs ear - and she had the squirts all over the wall!!!
I gave my pullets watermelon this past summer and they got pretty runny and squirty too.
So, as with introducing new food to any creature, only introduce one new food at a time in small quantities.
And only introduce a new food every other day - that way you can gauge how well they respond to it.
Learned my Lesson Twice!!!